The title is made partly in jest, of course, as we all know that money does in fact exist. What I'm trying to convey, however, is that money as we know it doesn't by itself represent anything useful, valuable, or meaningful to humankind - money is only a means at moving towards useful, valuable, or meaningful things. Money is just a storage system (similar to a battery) where the value we created is "stored" instead of spent.
Imagine a factory that produces electricity. That factory can either:
Now, there really isn't a third way is there? If we don't use it and we don't store it, the electricity will no longer be accessible to us.
In a similar manner, when we earn income by working or creating value in the world, we can either spend the income or we can store it in the form of US Dollars (or another type of currency). We can put these dollars into a checking account, a savings account, under our mattress, or invest in various ways, but either way, what we are doing is storing the purchasing power we created through our productive actions for use at a later time.
Of course, this is a big simplification and there are many gray areas and nuances that are ignored in our very simplified analysis, but it's suffice to say that thinking of money in this manner could prove both interesting and useful.
Now, if we do think of money as a battery, the next question is "What happens when we don't use it?" In general, like electricity stored within a battery, if we don't use the purchasing power stored in our money, the purchasing power will slowly wither away due to inflation. The purchasing power could also very abruptly be eliminated in the case of a some sort of national disaster that leaves the currency worthless (there are countless examples of this throughout history). So, if we are to be wise, we might want to diversify - we might want to store our accumulated wealth in different batteries in different places in an attempt to prevent an unreasonable amount of exposure due to a single point of failure. Additionally, knowing that all batteries degrade over time, we will want to pump the money out once in a while and put it back into productive endeavors (eg. investing in new businesses, purchasing real estate, purchasing education, donating it etc.).